Camera focus and stabilization system
Various embodiments include a camera with a voice coil motor (VCM) actuator assembly to provide autofocus (AF) and/or optical image stabilization (OIS) movement. The VCM actuator assembly is configured to move an image sensor of the camera in three dimensions (e.g. X, Y, and Z) to provide the AF and/or OIS movements. The VCM actuator assembly is asymmetrical and includes an at least partially open side that allows an optical assembly of the camera to pass through the open side of the VCM actuator. In some embodiments, the optical assembly is part of a folded optics arrangement of the camera that includes one or more prisms/and or lenses.
1. A camera, comprising:
an aperture configured to enable light to enter the camera;
an image sensor configured to capture the light that has entered the camera and convert the light into image signals;
a substrate carrier, configured to support the image sensor;
a carrier frame at least partially surrounding the substrate carrier and configured to support a plurality of magnets; and
an assembly that mechanically couples the substrate carrier to the carrier frame, and permits motion of the substrate carrier relative to the carrier frame in an autofocus (AF) direction, and permits motion of the carrier frame and the substrate carrier in a plurality of optical image stabilization (OIS) directions orthogonal to the autofocus (AF) direction;
the plurality of magnets comprising:
a first magnet coupled to a first side of the carrier frame;
a second magnet coupled to a second side of the carrier frame opposite the first side; and
a third magnet coupled to a third side of the carrier frame orthogonal to the first and second side of the carrier frame;
wherein magnetic fields from the first magnet and second magnet are used in a voice coil motor (VCM) actuator assembly to move the image sensor in the autofocus (AF) direction and move the image sensor in one of the optical image stabilization (OIS) directions orthogonal to the autofocus direction; and
wherein a magnetic field from the third magnet is used in the voice coil motor (VCM) actuator assembly to move the image sensor in a different one of the optical image stabilization directions orthogonal to the autofocus direction.
2. The camera of claim 1 , wherein:
the first and second magnets are two dual pole magnets mounted on the opposite sides of the carrier frame; and
the third magnet is a single pole magnet mounted on a side of the carrier frame orthogonal to the sides on which the dual pole magnets are mounted.
3. The camera of claim 1 , wherein no magnets are mounted on a fourth side of the carrier frame that remains open, such that a portion of an optical assembly of a folded optics arrangement camera can pass through the open side of the carrier frame.
4. The camera of claim 1 , further comprising:
respective coils associated with each of the first, second and third magnets of the VCM actuator assembly;
wherein the first, second and third magnets of the VCM actuator assembly move with the carrier frame and the respective coils associated with the magnets remain stationary.
5. The camera of claim 1 , wherein:
the assembly that mechanically couples comprises a static flexure positioned underneath the first, second and third magnets; and
the carrier frame is suspended above the static flexure.
6. The camera of claim 1 , wherein:
the first and second magnets are two dual pole magnets mounted on the opposite sides of the carrier frame; and
the camera further comprises:
a first coil coupled to the substrate carrier on a side of the substrate carrier adjacent to the first side of the carrier frame; and
a second coil coupled to the substrate carrier on another side of the substrate carrier that is adjacent to the second side of the carrier frame,
wherein the first coil and the second coil interact with the first dual pole magnet and the second dual pole magnet to cause the substrate carrier to move relative to the carrier frame in the autofocus (AF) direction.
7. The camera of claim 6 , further comprising:
a third coil coupled to a static flexure on a portion of the static flexure positioned adjacent to the dual pole magnet; and
a fourth coil coupled to the static flexure on a portion of the static flexure adjacent to the second dual pole magnet,
wherein the third coil and the fourth coil interact with the dual pole magnet and the second dual pole magnet to cause the carrier frame and the substrate carrier to move in a first optical image stabilization (OIS) direction; and
a fifth coil coupled to the static flexure on a portion of the static flexure adjacent to the single pole magnet,
wherein the fifth coil interacts with the single pole magnet to cause the carrier frame and the substrate carrier to move in a second optical image stabilization (OIS) direction orthogonal to the first optical image stabilization (OIS) direction.
8. The camera of claim 1 , wherein the camera is a folded optics camera comprising:
a prism configured to redirect the light that enters the camera via the aperture; and
an additional prism configured to redirect the light redirected by the prism such that the light is directed into the autofocus direction, wherein the image sensor is positioned in the camera such that the light directed in the autofocus direction is directed toward the image sensor.
9. A voice coil motor actuator assembly, comprising:
a substrate carrier configured to support an image sensor;
a carrier frame at least partially surrounding the substrate carrier and configured to support a plurality of magnets; and
an assembly that mechanically couples the substrate carrier to the carrier frame and permits motion of the substrate carrier relative to the carrier frame in an autofocus (AF) direction, and permits motion of the carrier frame and the substrate carrier in a plurality of optical image stabilization (OIS) directions orthogonal to the autofocus (AF) direction;
the plurality of magnets comprising:
a first magnet coupled to a first side of the carrier frame;
a second magnet coupled to a second side of the carrier frame opposite the first side; and
a third magnet coupled to a third side of the carrier frame orthogonal to the first and second side of the carrier frame;
wherein magnetic fields from the first magnet and second magnet are used in the voice coil motor (VCM) actuator assembly move the image sensor in the autofocus (AF) direction and move the image sensor in one of the optical image stabilization (OIS) directions orthogonal to the autofocus direction; and
wherein a magnetic field from the third magnet is used in the voice coil motor (VCM) actuator assembly to move the image sensor in a different one of the optical image stabilization (OIS) directions orthogonal to the autofocus direction.
10. The voice coil motor actuator assembly of claim 9 , wherein:
the first and second magnets are two dual pole magnets mounted on the opposite sides of the carrier frame; and
the third magnet is a single pole magnet mounted on a side of the carrier frame orthogonal to the sides on which the dual pole magnets are mounted.
11. The voice coil motor actuator assembly of claim 9 , wherein no magnets are mounted on a fourth side of the carrier frame that remains open, such that a portion of an optical assembly of a folded optics arrangement camera can pass through the open side of the carrier frame.
12. The voice coil motor actuator assembly of claim 9 , further comprising:
respective coils associated with each of the first, second and third magnets of the VCM actuator assembly;
wherein the first, second and third magnets of the VCM actuator assembly move with the carrier frame and the respective coils associated with the magnets remain stationary.
13. The voice coil motor actuator assembly of claim 9 , wherein:
the first and second magnets are two dual pole magnets mounted on the opposite sides of the carrier frame; and
the voice coil motor actuator assembly further comprises:
a first coil coupled to the substrate carrier on a side of the substrate carrier adjacent to the first side of the carrier frame; and
a second coil coupled to the substrate carrier on another side of the substrate carrier that is adjacent to the second side of the carrier frame,
wherein the first coil and the second coil interact with the first dual pole magnet and the second dual pole magnet to cause the substrate carrier to move relative to the carrier frame in the autofocus (AF) direction.
14. The voice coil motor assembly of claim 9 , further comprising:
a third coil coupled to a static flexure on a portion of the static flexure positioned adjacent to the dual pole magnet and
a fourth coil coupled to the static flexure on a portion of the static flexure adjacent to the second dual pole magnet,
wherein the third coil and the fourth coil interact with the first dual pole magnet and the second dual pole magnet to cause the carrier frame and the substrate carrier to move in a first optical image stabilization (OIS) direction; and
a fifth coil coupled to the static flexure on a portion of the static flexure adjacent to the single pole magnet,
wherein the fifth coil interacts with the single pole magnet to cause the carrier frame and the substrate carrier to move in a second optical image stabilization (OIS) direction orthogonal to the first optical image stabilization (OIS) direction.
15. A mobile multifunction device, comprising:
a camera comprising:
an aperture configured to enable light to enter the camera;
an image sensor configured to capture the light that has entered the camera and convert the light into image signals; and
a voice coil motor actuator assembly comprising:
a substrate carrier configured to support the image sensor;
a carrier frame at least partially surrounding the substrate carrier and configured to support a plurality of magnets; and
an assembly that mechanically couples the substrate carrier to the carrier frame, and permits motion of the substrate carrier relative to the carrier frame in an autofocus (AF) direction, and permits motion of the carrier frame and the substrate carrier in a plurality of optical image stabilization (OIS) directions orthogonal to the autofocus (AF) direction;
the plurality of magnets comprising:
a first magnet coupled to a first side of the carrier frame;
a second magnet coupled to a second side of the carrier frame opposite the first side; and
a third magnet coupled to a third side of the carrier frame orthogonal to the first and second side of the carrier frame;
wherein magnetic fields from the first magnet and second magnet are used in the voice coil motor (VCM) actuator assembly to move the image sensor in the autofocus (AF) direction and move the image sensor in one of the optical image stabilization (OIS) directions orthogonal to the autofocus direction; and
wherein a magnetic field from the third magnet is used in the voice coil motor (VCM) actuator assembly to move the image sensor in a different one of the optical image stabilization (OIS) directions orthogonal to the autofocus direction.
16. The mobile multi-function device of claim 15 , wherein the camera is a folded optics camera comprising:
a prism configured to redirect the light that enters the camera via the aperture; and
an additional prism configured to redirect the light redirected by the prism such that the light is directed into the autofocus direction, wherein the image sensor is positioned in the camera such that the light directed in the autofocus direction is directed toward the image sensor.
17. The mobile multi-function device of claim 15 , wherein:
the first and second magnets are two dual pole magnets mounted on the opposite sides of the carrier frame; and
the third magnet is a single pole magnet mounted on a side of the carrier frame orthogonal to the sides on which the dual pole magnets are mounted.
18. The mobile multi-function device of claim 15 ,
wherein no magnets are mounted on a fourth side of the carrier frame that remains open, such that a portion of an optical assembly of a folded optics arrangement camera can pass through the open side of the carrier frame.
19. The mobile multi-function device of claim 15 , wherein
the first and second magnets are two dual pole magnets mounted on the opposite sides of the carrier frame; and
the voice coil motor actuator assembly further comprises:
a first coil coupled to the substrate carrier on a side of the substrate carrier adjacent to the first side of the carrier frame; and
a second coil coupled to the substrate carrier on another side of the substrate carrier that is adjacent to the second side of the carrier frame,
wherein the first coil and the second coil interact with the dual pole magnet and the second dual pole magnet to cause the substrate carrier to move relative to the carrier frame in the autofocus (AF) direction.
20. The mobile-multi-function device of claim 19 ,
wherein the voice coil motor actuator assembly further comprises:
a third coil coupled to a static flexure on a portion of the static flexure positioned adjacent to the dual pole magnet and
a fourth coil coupled to the static flexure on a portion of the static flexure adjacent to the second dual pole magnet,
wherein the third coil and the fourth coil interact with the dual pole magnet and the second dual pole magnet to cause the carrier frame and the substrate carrier to move in a first optical image stabilization (OIS) direction; and
a fifth coil coupled to the static flexure on a portion of the static flexure adjacent to the single pole magnet,
wherein the fifth coil interacts with the single pole magnet to cause the carrier frame and the substrate carrier to move in a second optical image stabilization (OIS) direction orthogonal to the first optical image stabilization (OIS) direction.